Steam-boiler setting.



' ,No. 7|5,256. Pat ent'ed Dec.'9, 1902.

E. aisson.

STEAM BOILER SETTING.

(Application filed Apr. 3, 1902.) (No Modai.) 2 Sheets-Sheet i.

WITNESSES: INVENTDR /4m ikflwggimgm ATTORNEY UNITED STAT S PATENT OFFICE.

EDWARD GIBSON, OF JERSEY CITY, NEW JERSEY.

STEAM-BOILER SETTING.

SPECIFICATION forming part of Letters Patent N 0. 715,256, dated December 9, 1902. Application filed April 3, 1902. Serial 1W0. 101,141. (No model.)

To all whom i2; 'may concern:

Be it known that I, EDWARD GIBSON, a citizen of the United States, residing in Jersey City, in the county of Hudson and State of New Jersey, have invented a certain new and useful Improvementin Steam-Boiler Settings, of which the following is a specification.

There are provisions for blowing by the aid of steam-jets. I have devised important improvements in provisions for superheating the steam thus used and for promoting the complete combustion of the gaseous portions of the fuel and for baffling the escape of such Figure 1 is a longitudinal section on the line 1 l in Fig. 3. Fig. 2 is a transverse vertical section on the line 2 2 in Fig. 1. Fig. 3 is a transverse vertical section on two planes. The left side is on the line 3* 3* in Fig. 1 and the right side on the line 3 3 in Fig. 1. Fig. 4 is a plan View of the tire-bridge and the superheating-pipes with the tiles removed and a section through the adjacent walls at the same level.

Similar letters of reference indicate corresponding parts in all the figures where they appear.

A is the boiler; B, a pipe bringing steam from the dome thereof; B, a series of horizontal returns arranged in a chamber and serving as a superheater for the steam coming through it; B an extension of the pipes beyond such superheater, and B a coil arranged in the wall of the ash-pit having perforations b, from which jets of steam are forcibly projected toward the interior of the ash-pit, drawing a large volume of air with them on a principle well understood. The efiect is to increase the pressure in the ash-pit, one result of which is to quicken the draft upward through the fuel lying on the grate G in the ordinary manner and another to blow a mixture of steam and air rearward and upward from the ash-pit through smoothly-curved pipes D.

erally to the right and left.

E E E E are four shells, of cast-iron, each matched on one of the pipes D and having perforations 6 along its front face and along its top. The mixture of air and steam thus treated becomes heated in these shells and on being expelled forward and upward through these apertures e promotes the consumption of all the combustible gaseous products flow ing rearward over and through the bridgewall. These shells-E are set a little distance apart. The spaces between (marked f) allow corresponding sheets of bu rning gases to flow from the furnace through the fire-bridge into a rearwardly-extending chamber f, which performs an important function. Instead of, as usual, allowing a great depth'of the back connection in rear of the fire-bridge I provide a continuous layer of tiles F, lining the bottom of the back connection a rearward to a point near the back end of the boiler. These tiles are supported at the proper high level and slant upward slightly, as indicated in Fig. 1. They rest on bars G, which are in turn supported on bearers H. The horizontal returns of the steam-pipe lie in a shallow chamberf below these tiles. Still below this chamber are tiles 1, which may reston the earth or any other suitable foundation so long as they are held at about the level indicated. The chamber f receives a current of hot gases through the several apertures f in the bridge-wall. These gases move rearward, the steam flowing through the returns B being superheated partly by the bath of burning gas thus flowing and partly by radiation from the stronger current of hot gases above. The chamber f extends rearward considerably farther than. the snperheating-returns B, thereby providing a space in which the gases may flow lat- Short upright passages or fines f in the side walls M allow these gases to rise and join the larger quantity flowing rearward above the tiles F and maintain a clean condition of the chamber 3*" free from dust and ashes. .Inclined chutes or, starting from a point near the rear end of the back connection a, open into the uptake a at a low point, as shown. These passages are controlled by doors I, which are closed except when it is desired to remove the ashes and dust, which accumulate more or less rapidly. The subsequent treatment of the gases may be of any ordinary or suitable character. I will describe them as flowing forward through the tubes A, rising in the front connection and ultimatelyflowing backward over the main body of the boiler and rising through a stack at the rear.

I attach importance to the construction at the rear end of the back connection, where the gases after traversing rearward through the horizontal passages a and f rise in the uptake 03 at the rear of the boiler to return through the tubes A. I have discovered that the active current thus rising in the center is liable to injure the tube ends, and especially to burn the bolts and nuts securing the handhole cover A I defend all these parts from the current by making a solid wall under the rear end of the boiler at the center, as indi cated by M, and provide sufficient openings each side, as indicated by 'm m, for the passage of the gases. I term this a bafile-wall. It performs an important function in addition to the protection of the hand-hole fastenings and the tube ends in its baffling and preventing the too-rapid escape of the hot gases. I ascribe to the retardation of the circulation of the hot gases under the boiler due to this baflle-wall a good portion of the economy realized by my system.

The upward inclination of the tile floor F may be only sutficient to compensate for the contraction of the gases in volume as they become cooler in moving rearward.

Modifications may be made without departing from the principle or sacrificing the advantages of the invention.

It will be understood that the pipes B B, &c., bringing the steam and causing it to blow into the ash-pit, may be in as many lengths as desired, properly coupled together. Also that there may be cocks or other valves at any required points.

R is an automatic regulator which varies the opening for the passage of the steam according to the wants of the furnace in order to maintain a substantially uniform pressure of the steam in the boiler under widely-varying conditions. This regulator may be omitted, if preferred.

I have shown the central spacef narrower than the others and prefer to so arrange them, so that the chamber f is liberally supplied all the way across.

The cross-section of the chamberf, with the tiling F above and I below, may be plane, or it may be curved, so as to be concentric to the boiler, or it may be a form of cross-section about half-way between these limits. I prefer the latter.

Instead of the four shells E a greater number may be employed, taking care always to provide a correspondingly-increased number of the smoothly-curved pipesD to supply the mixture of steam and air thereto, or a less number, three or even two, may suffice.

I claim as my invention- 1. In a boiler-setting having ashallow back connection a, the flooring F of smooth tiles slightly inclining upward and having the in clined chutes a and baffle-wall M arranged to serve substantially as herein specified.

2. In a boiler-setting, provisions B for superheating steam arranged in a chamber F under a shallow back connection a and separated therefrom by a flooring F of smooth tiles, a pipe B bringing steam thereto from the boiler,a pipe 13 leading the superheated steam therefrom to the ash-pit and a device 13 having perforations b for blowing such steam in small jets and thereby dragging air into the ash-pit, all arranged for joint operation substantially as herein specified.

3. In aboiler-setting having a shallow back connection a, the flooring F of smooth tiles, a series of return-pipes B mounted in a chamberf under such flooring, and connections, from such pipes to the boiler and to a steamblower respectively, all combined and arranged to serve substantially as herein specified.

4. In a boiler-setting havinga shallow back connection a, the fiooringF of smooth tiles, a series of return-pipes B mounted in a chamber f under such flooring and spacesfin the fire-bridge arranged to provide a flow of hot gases into such chamber, all substantially as herein specified.

5. In a boiler-setting having a shallow back connection a the flooring F of smooth tiles, a series of return-pipes B mounted in a chamber f under such flooring, and spaces fin the fire-bridge arranged to provide a flow of hot gases into such chamber and short ascending fines f 2 formed in the side Walls M, providing shorter passages for the escape of such gases into the main passage a, all arranged for joint operation substantially as herein specified.

In testimony that I claim the invention above set forth I afl'ix my signature in presence of two witnesses.

EDWARD GIBSON.

Witnesses:

J. B. CLAUTICE, M. F. BOYLE. 

